Strong genetic evidence for a selective influence of GABA A receptors on a component of the bipolar disorder phenotype

N. Craddock, L. Jones, I. R. Jones, G. Kirov, E. K. Green, D. Grozeva, V. Moskvina, I. Nikolov, M. L. Hamshere, D. Vukcevic, S. Caesar, K. Gordon-Smith, C. Fraser, E. Russell, N. Norton, G. Breen, D. St Clair, D. A. Collier, A. H. Young, I. N. FerrierA. Farmer, P. McGuffin, P. A. Holmans, P. Donnelly, M. J. Owen, M. C. O'Donovan

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

Despite compelling evidence for a major genetic contribution to risk of bipolar mood disorder, conclusive evidence implicating specific genes or pathophysiological systems has proved elusive. In part this is likely to be related to the unknown validity of current phenotype definitions and consequent aetiological heterogeneity of samples. In the recent Wellcome Trust Case Control Consortium genome-wide association analysis of bipolar disorder (1868 cases, 2938 controls) one of the most strongly associated polymorphisms lay within the gene encoding the GABA A receptor Β1 subunit, GABRB1. Aiming to increase biological homogeneity, we sought the diagnostic subset that showed the strongest signal at this polymorphism and used this to test for independent evidence of association with other members of the GABA A receptor gene family. The index signal was significantly enriched in the 279 cases meeting Research Diagnostic Criteria for schizoaffective disorder, bipolar type (P3.8 × 10 -6). Independently, these cases showed strong evidence that variation in GABA A receptor genes influences risk for this phenotype (independent system-wide P6.6 × 10 -5) with association signals also at GABRA4, GABRB3, GABRA5 and GABRR1. Our findings have the potential to inform understanding of presentation, pathogenesis and nosology of bipolar disorders. Our method of phenotype refinement may be useful in studies of other complex psychiatric and non-psychiatric disorders.

Original languageEnglish (US)
Pages (from-to)146-153
Number of pages8
JournalMolecular Psychiatry
Volume15
Issue number2
DOIs
StatePublished - Jan 2010

Keywords

  • Bipolar disorder
  • GABAA receptors
  • Genetics
  • Nosology
  • Schizoaffective disorder

ASJC Scopus subject areas

  • Molecular Biology
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'Strong genetic evidence for a selective influence of GABA <sub>A</sub> receptors on a component of the bipolar disorder phenotype'. Together they form a unique fingerprint.

  • Cite this

    Craddock, N., Jones, L., Jones, I. R., Kirov, G., Green, E. K., Grozeva, D., Moskvina, V., Nikolov, I., Hamshere, M. L., Vukcevic, D., Caesar, S., Gordon-Smith, K., Fraser, C., Russell, E., Norton, N., Breen, G., St Clair, D., Collier, D. A., Young, A. H., ... O'Donovan, M. C. (2010). Strong genetic evidence for a selective influence of GABA A receptors on a component of the bipolar disorder phenotype. Molecular Psychiatry, 15(2), 146-153. https://doi.org/10.1038/mp.2008.66